"Buildism warning: This game is using an unsupported scripting technique..."

[Duck]

"...That will soon be removed, please notify the creator that <Text is cut off by in game window size>"

Which scripting technique is this referring to?

Using sleep() for a period of time longer than 0.5 seconds in an event handler. It will give you a more detailed message in edit mode (if it's your game, of course.)

How are we meant to make things with delays if we can't use sleep?

Notice "in an event handler".

"How am I meant to put a ten second delay in my function if I can't use sleep?" Happy?